<HTML><BODY style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; "><BR><DIV><DIV>On Aug 25, 2007, at 7:05 PM, Joshua Gargus wrote:</DIV><BR class="Apple-interchange-newline"><BLOCKQUOTE type="cite"><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><BR></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">On Aug 25, 2007, at 6:17 AM, Fabio Filasieno wrote:</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><BR></DIV> <BLOCKQUOTE type="cite"><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><BR></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">obj message1: param</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><SPAN class="Apple-converted-space"> </SPAN>| message2:param</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><SPAN class="Apple-converted-space"> </SPAN>| message1: param</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><SPAN class="Apple-converted-space"> </SPAN>| message2:param</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><SPAN class="Apple-converted-space"> </SPAN>| message1: param</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><SPAN class="Apple-converted-space"> </SPAN>| message2:param</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><SPAN class="Apple-converted-space"> </SPAN>| message1: param</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><SPAN class="Apple-converted-space"> </SPAN>| message2:param</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><SPAN class="Apple-converted-space"> </SPAN>| message1: param</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><SPAN class="Apple-converted-space"> </SPAN>| message2:param</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><SPAN class="Apple-converted-space"> </SPAN>| message1: param</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><SPAN class="Apple-converted-space"> </SPAN>| message2:param</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><BR></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">now some mix and match ...</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><BR></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">obj | send</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><SPAN class="Apple-converted-space"> </SPAN>| left: a right:b</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><SPAN class="Apple-converted-space"> </SPAN>| send | send | send</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><SPAN class="Apple-converted-space"> </SPAN>| left: a right:b</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><SPAN class="Apple-converted-space"> </SPAN>| message</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><BR></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">The pipe is needed to support a pipe&filter style of programming. That perfectly works with Smalltalk syntax, and truly</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">opens up a better way of doing functional transformations.</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><BR></DIV> </BLOCKQUOTE><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><BR></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">This all seems very hypothetical.<SPAN class="Apple-converted-space"> </SPAN>In what problem domain would you end up writing code like this?<SPAN class="Apple-converted-space"> </SPAN>I've never written such code myself, and I haven't seen anyone else write such code either.<SPAN class="Apple-converted-space"> </SPAN>Maybe that's just because people shy away from it because of all of the parentheses, but I can't accept that without a real code example to support it.</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><BR></DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Josh</DIV><DIV style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><BR></DIV> </BLOCKQUOTE></DIV><BR> <SPAN class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "></SPAN><DIV><BR class="khtml-block-placeholder"></DIV><DIV>a sequence of filter, map, fold, zip, ... it's extreamly common in any case you have to do quite some collection manipulation.</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>I don't know about other people, but I'll tell where I use it...</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>Selection, Projection, Cartesian Product, Union, Difference, Intersection are operators that I use a lot</DIV><DIV>in any data selection/manipulation context.</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>I use them as an "embedded SQL" on objective data. </DIV><DIV>You have persistent data in a file. You load the object graph. You query, delete, add, select data according to what results you get</DIV><DIV>from Selection, Projection, Cartesian Product, Union, Difference, Intersection.</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>Making easy to combine operators is not hypothetical ... the domain is the most popular: data selection and manipulation. </DIV><DIV>The first thing that comes to my mind is websites.</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>Example: </DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>db getBlogposts </DIV><DIV> | filter: [ :blogPost | blogPost data < (today - 7 days)]</DIV><DIV> | filter: [ :blogPost | db coolPosts includes: item )</DIV><DIV> | collectMails </DIV><DIV> | do: [ :mail | "Happy to announce ..."]</DIV><DIV> </DIV><DIV>This kind of coding is extremely common ... the whole Python language is built around maps, tuples, list ...</DIV><DIV>an in Ocaml and Haskell too ... the list/map libraries with their zip, foldr, foldl, etx ... It's easy to think how you would use these kind functions</DIV><DIV>with the PIPE.</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV><BR class="khtml-block-placeholder"></DIV><BR></BODY></HTML>